eHoefler,
Jeremy's user name is 84 Sportscoach III.
I can tell him (at great length if he cares) that he might as well plan to have the fuel tanks down now. This as the owner of another seasoned coach. He can count on all the rubber in the fuel system to be shot and it was probably not alcohol compatible to begin with. It usually requires that the tanks be taken down to replace all the fuel lines. While there, there are big o-rings that seal the sending units in the tanks. If it is new enough to have in tank pump(s), then those and the level senders might as well get replaced at the same time.
Do I have to add "Been There - Done that" (look at the coach in my pic)